net/nfs.c

   1 /*
   2  * NFS support driver - based on etherboot and U-BOOT's tftp.c
   3  *
   4  * Masami Komiya <mkomiya@sonare.it> 2004
   5  *
   6  */
   7
   8 /* NOTE: the NFS code is heavily inspired by the NetBSD netboot code (read:
   9  * large portions are copied verbatim) as distributed in OSKit 0.97.  A few
  10  * changes were necessary to adapt the code to Etherboot and to fix several
  11  * inconsistencies.  Also the RPC message preparation is done "by hand" to
  12  * avoid adding netsprintf() which I find hard to understand and use.  */
  13
  14 /* NOTE 2: Etherboot does not care about things beyond the kernel image, so
  15  * it loads the kernel image off the boot server (ARP_SERVER) and does not
  16  * access the client root disk (root-path in dhcpd.conf), which would use
  17  * ARP_ROOTSERVER.  The root disk is something the operating system we are
  18  * about to load needs to use.  This is different from the OSKit 0.97 logic.  */
  19
  20 /* NOTE 3: Symlink handling introduced by Anselm M Hoffmeister, 2003-July-14
  21  * If a symlink is encountered, it is followed as far as possible (recursion
  22  * possible, maximum 16 steps). There is no clearing of ".."'s inside the
  23  * path, so please DON'T DO THAT. thx. */
  24
  25 #include <common.h>
  26 #include <command.h>
  27 #include <net.h>
  28 #include <malloc.h>
  29 #include "nfs.h"
  30 #include "bootp.h"
  31
  32 /*#define NFS_DEBUG*/
  33
  34 #if defined(CONFIG_CMD_NET) && defined(CONFIG_CMD_NFS)
  35
  36 #define HASHES_PER_LINE 65      /* Number of "loading" hashes per line  */
  37 #define NFS_RETRY_COUNT 30
  38 #define NFS_TIMEOUT 2UL
  39
  40 static int fs_mounted = 0;
  41 static unsigned long rpc_id = 0;
  42 static int nfs_offset = -1;
  43 static int nfs_len;
  44
  45 static char dirfh[NFS_FHSIZE];  /* file handle of directory */
  46 static char filefh[NFS_FHSIZE]; /* file handle of kernel image */
  47
  48 static int      NfsDownloadState;
  49 static IPaddr_t NfsServerIP;
  50 static int      NfsSrvMountPort;
  51 static int      NfsSrvNfsPort;
  52 static int      NfsOurPort;
  53 static int      NfsTimeoutCount;
  54 static int      NfsState;
  55 #define STATE_PRCLOOKUP_PROG_MOUNT_REQ  1
  56 #define STATE_PRCLOOKUP_PROG_NFS_REQ    2
  57 #define STATE_MOUNT_REQ                 3
  58 #define STATE_UMOUNT_REQ                4
  59 #define STATE_LOOKUP_REQ                5
  60 #define STATE_READ_REQ                  6
  61 #define STATE_READLINK_REQ              7
  62
  63 static char default_filename[64];
  64 static char *nfs_filename;
  65 static char *nfs_path;
  66 static char nfs_path_buff[2048];
  67
  68 static __inline__ int
  69 store_block (uchar * src, unsigned offset, unsigned len)
  70 {
  71         ulong newsize = offset + len;
  72 #ifdef CFG_DIRECT_FLASH_NFS
  73         int i, rc = 0;
  74
  75         for (i=0; i<CFG_MAX_FLASH_BANKS; i++) {
  76                 /* start address in flash? */
  77                 if (load_addr + offset >= flash_info[i].start[0]) {
  78                         rc = 1;
  79                         break;
  80                 }
  81         }
  82
  83         if (rc) { /* Flash is destination for this packet */
  84                 rc = flash_write ((uchar *)src, (ulong)(load_addr+offset), len);
  85                 if (rc) {
  86                         flash_perror (rc);
  87                         return -1;
  88                 }
  89         } else
  90 #endif /* CFG_DIRECT_FLASH_NFS */
  91         {
  92                 (void)memcpy ((void *)(load_addr + offset), src, len);
  93         }
  94
  95         if (NetBootFileXferSize < (offset+len))
  96                 NetBootFileXferSize = newsize;
  97         return 0;
  98 }
  99
 100 static char*
 101 basename (char *path)
 102 {
 103         char *fname;
 104
 105         fname = path + strlen(path) - 1;
 106         while (fname >= path) {
 107                 if (*fname == '/') {
 108                         fname++;
 109                         break;
 110                 }
 111                 fname--;
 112         }
 113         return fname;
 114 }
 115
 116 static char*
 117 dirname (char *path)
 118 {
 119         char *fname;
 120
 121         fname = basename (path);
 122         --fname;
 123         *fname = '\0';
 124         return path;
 125 }
 126
 127 /**************************************************************************
 128 RPC_ADD_CREDENTIALS - Add RPC authentication/verifier entries
 129 **************************************************************************/
 130 static long *rpc_add_credentials (long *p)
 131 {
 132         int hl;
 133         int hostnamelen;
 134         char hostname[256];
 135
 136         strcpy (hostname, "");
 137         hostnamelen=strlen (hostname);
 138
 139         /* Here's the executive summary on authentication requirements of the
 140          * various NFS server implementations:  Linux accepts both AUTH_NONE
 141          * and AUTH_UNIX authentication (also accepts an empty hostname field
 142          * in the AUTH_UNIX scheme).  *BSD refuses AUTH_NONE, but accepts
 143          * AUTH_UNIX (also accepts an empty hostname field in the AUTH_UNIX
 144          * scheme).  To be safe, use AUTH_UNIX and pass the hostname if we have
 145          * it (if the BOOTP/DHCP reply didn't give one, just use an empty
 146          * hostname).  */
 147
 148         hl = (hostnamelen + 3) & ~3;
 149
 150         /* Provide an AUTH_UNIX credential.  */
 151         *p++ = htonl(1);                /* AUTH_UNIX */
 152         *p++ = htonl(hl+20);            /* auth length */
 153         *p++ = htonl(0);                /* stamp */
 154         *p++ = htonl(hostnamelen);      /* hostname string */
 155         if (hostnamelen & 3) {
 156                 *(p + hostnamelen / 4) = 0; /* add zero padding */
 157         }
 158         memcpy (p, hostname, hostnamelen);
 159         p += hl / 4;
 160         *p++ = 0;                       /* uid */
 161         *p++ = 0;                       /* gid */
 162         *p++ = 0;                       /* auxiliary gid list */
 163
 164         /* Provide an AUTH_NONE verifier.  */
 165         *p++ = 0;                       /* AUTH_NONE */
 166         *p++ = 0;                       /* auth length */
 167
 168         return p;
 169 }
 170
 171 /**************************************************************************
 172 RPC_LOOKUP - Lookup RPC Port numbers
 173 **************************************************************************/
 174 static void
 175 rpc_req (int rpc_prog, int rpc_proc, uint32_t *data, int datalen)
 176 {
 177         struct rpc_t pkt;
 178         unsigned long id;
 179         uint32_t *p;
 180         int pktlen;
 181         int sport;
 182
 183         id = ++rpc_id;
 184         pkt.u.call.id = htonl(id);
 185         pkt.u.call.type = htonl(MSG_CALL);
 186         pkt.u.call.rpcvers = htonl(2);  /* use RPC version 2 */
 187         pkt.u.call.prog = htonl(rpc_prog);
 188         pkt.u.call.vers = htonl(2);     /* portmapper is version 2 */
 189         pkt.u.call.proc = htonl(rpc_proc);
 190         p = (uint32_t *)&(pkt.u.call.data);
 191
 192         if (datalen)
 193                 memcpy ((char *)p, (char *)data, datalen*sizeof(uint32_t));
 194
 195         pktlen = (char *)p + datalen*sizeof(uint32_t) - (char *)&pkt;
 196
 197         memcpy ((char *)NetTxPacket + NetEthHdrSize() + IP_HDR_SIZE, (char *)&pkt, pktlen);
 198
 199         if (rpc_prog == PROG_PORTMAP)
 200                 sport = SUNRPC_PORT;
 201         else if (rpc_prog == PROG_MOUNT)
 202                 sport = NfsSrvMountPort;
 203         else
 204                 sport = NfsSrvNfsPort;
 205
 206         NetSendUDPPacket (NetServerEther, NfsServerIP, sport, NfsOurPort, pktlen);
 207 }
 208
 209 /**************************************************************************
 210 RPC_LOOKUP - Lookup RPC Port numbers
 211 **************************************************************************/
 212 static void
 213 rpc_lookup_req (int prog, int ver)
 214 {
 215         uint32_t data[16];
 216
 217         data[0] = 0; data[1] = 0;       /* auth credential */
 218         data[2] = 0; data[3] = 0;       /* auth verifier */
 219         data[4] = htonl(prog);
 220         data[5] = htonl(ver);
 221         data[6] = htonl(17);    /* IP_UDP */
 222         data[7] = 0;
 223
 224         rpc_req (PROG_PORTMAP, PORTMAP_GETPORT, data, 8);
 225 }
 226
 227 /**************************************************************************
 228 NFS_MOUNT - Mount an NFS Filesystem
 229 **************************************************************************/
 230 static void
 231 nfs_mount_req (char *path)
 232 {
 233         uint32_t data[1024];
 234         uint32_t *p;
 235         int len;
 236         int pathlen;
 237
 238         pathlen = strlen (path);
 239
 240         p = &(data[0]);
 241         p = (uint32_t *)rpc_add_credentials((long *)p);
 242
 243         *p++ = htonl(pathlen);
 244         if (pathlen & 3) *(p + pathlen / 4) = 0;
 245         memcpy (p, path, pathlen);
 246         p += (pathlen + 3) / 4;
 247
 248         len = (uint32_t *)p - (uint32_t *)&(data[0]);
 249
 250         rpc_req (PROG_MOUNT, MOUNT_ADDENTRY, data, len);
 251 }
 252
 253 /**************************************************************************
 254 NFS_UMOUNTALL - Unmount all our NFS Filesystems on the Server
 255 **************************************************************************/
 256 static void
 257 nfs_umountall_req (void)
 258 {
 259         uint32_t data[1024];
 260         uint32_t *p;
 261         int len;
 262
 263         if ((NfsSrvMountPort == -1) || (!fs_mounted)) {
 264                 /* Nothing mounted, nothing to umount */
 265                 return;
 266         }
 267
 268         p = &(data[0]);
 269         p = (uint32_t *)rpc_add_credentials ((long *)p);
 270
 271         len = (uint32_t *)p - (uint32_t *)&(data[0]);
 272
 273         rpc_req (PROG_MOUNT, MOUNT_UMOUNTALL, data, len);
 274 }
 275
 276 /***************************************************************************
 277  * NFS_READLINK (AH 2003-07-14)
 278  * This procedure is called when read of the first block fails -
 279  * this probably happens when it's a directory or a symlink
 280  * In case of successful readlink(), the dirname is manipulated,
 281  * so that inside the nfs() function a recursion can be done.
 282  **************************************************************************/
 283 static void
 284 nfs_readlink_req (void)
 285 {
 286         uint32_t data[1024];
 287         uint32_t *p;
 288         int len;
 289
 290         p = &(data[0]);
 291         p = (uint32_t *)rpc_add_credentials ((long *)p);
 292
 293         memcpy (p, filefh, NFS_FHSIZE);
 294         p += (NFS_FHSIZE / 4);
 295
 296         len = (uint32_t *)p - (uint32_t *)&(data[0]);
 297
 298         rpc_req (PROG_NFS, NFS_READLINK, data, len);
 299 }
 300
 301 /**************************************************************************
 302 NFS_LOOKUP - Lookup Pathname
 303 **************************************************************************/
 304 static void
 305 nfs_lookup_req (char *fname)
 306 {
 307         uint32_t data[1024];
 308         uint32_t *p;
 309         int len;
 310         int fnamelen;
 311
 312         fnamelen = strlen (fname);
 313
 314         p = &(data[0]);
 315         p = (uint32_t *)rpc_add_credentials ((long *)p);
 316
 317         memcpy (p, dirfh, NFS_FHSIZE);
 318         p += (NFS_FHSIZE / 4);
 319         *p++ = htonl(fnamelen);
 320         if (fnamelen & 3) *(p + fnamelen / 4) = 0;
 321         memcpy (p, fname, fnamelen);
 322         p += (fnamelen + 3) / 4;
 323
 324         len = (uint32_t *)p - (uint32_t *)&(data[0]);
 325
 326         rpc_req (PROG_NFS, NFS_LOOKUP, data, len);
 327 }
 328
 329 /**************************************************************************
 330 NFS_READ - Read File on NFS Server
 331 **************************************************************************/
 332 static void
 333 nfs_read_req (int offset, int readlen)
 334 {
 335         uint32_t data[1024];
 336         uint32_t *p;
 337         int len;
 338
 339         p = &(data[0]);
 340         p = (uint32_t *)rpc_add_credentials ((long *)p);
 341
 342         memcpy (p, filefh, NFS_FHSIZE);
 343         p += (NFS_FHSIZE / 4);
 344         *p++ = htonl(offset);
 345         *p++ = htonl(readlen);
 346         *p++ = 0;
 347
 348         len = (uint32_t *)p - (uint32_t *)&(data[0]);
 349
 350         rpc_req (PROG_NFS, NFS_READ, data, len);
 351 }
 352
 353 /**************************************************************************
 354 RPC request dispatcher
 355 **************************************************************************/
 356
 357 static void
 358 NfsSend (void)
 359 {
 360 #ifdef NFS_DEBUG
 361         printf ("%s\n", __FUNCTION__);
 362 #endif
 363
 364         switch (NfsState) {
 365         case STATE_PRCLOOKUP_PROG_MOUNT_REQ:
 366                 rpc_lookup_req (PROG_MOUNT, 1);
 367                 break;
 368         case STATE_PRCLOOKUP_PROG_NFS_REQ:
 369                 rpc_lookup_req (PROG_NFS, 2);
 370                 break;
 371         case STATE_MOUNT_REQ:
 372                 nfs_mount_req (nfs_path);
 373                 break;
 374         case STATE_UMOUNT_REQ:
 375                 nfs_umountall_req ();
 376                 break;
 377         case STATE_LOOKUP_REQ:
 378                 nfs_lookup_req (nfs_filename);
 379                 break;
 380         case STATE_READ_REQ:
 381                 nfs_read_req (nfs_offset, nfs_len);
 382                 break;
 383         case STATE_READLINK_REQ:
 384                 nfs_readlink_req ();
 385                 break;
 386         }
 387 }
 388
 389 /**************************************************************************
 390 Handlers for the reply from server
 391 **************************************************************************/
 392
 393 static int
 394 rpc_lookup_reply (int prog, uchar *pkt, unsigned len)
 395 {
 396         struct rpc_t rpc_pkt;
 397
 398         memcpy ((unsigned char *)&rpc_pkt, pkt, len);
 399
 400 #ifdef NFS_DEBUG
 401         printf ("%s\n", __FUNCTION__);
 402 #endif
 403
 404         if (ntohl(rpc_pkt.u.reply.id) != rpc_id)
 405                 return -1;
 406
 407         if (rpc_pkt.u.reply.rstatus  ||
 408             rpc_pkt.u.reply.verifier ||
 409             rpc_pkt.u.reply.astatus) {
 410                 return -1;
 411         }
 412
 413         switch (prog) {
 414         case PROG_MOUNT:
 415                 NfsSrvMountPort = ntohl(rpc_pkt.u.reply.data[0]);
 416                 break;
 417         case PROG_NFS:
 418                 NfsSrvNfsPort = ntohl(rpc_pkt.u.reply.data[0]);
 419                 break;
 420         }
 421
 422         return 0;
 423 }
 424
 425 static int
 426 nfs_mount_reply (uchar *pkt, unsigned len)
 427 {
 428         struct rpc_t rpc_pkt;
 429
 430 #ifdef NFS_DEBUG
 431         printf ("%s\n", __FUNCTION__);
 432 #endif
 433
 434         memcpy ((unsigned char *)&rpc_pkt, pkt, len);
 435
 436         if (ntohl(rpc_pkt.u.reply.id) != rpc_id)
 437                 return -1;
 438
 439         if (rpc_pkt.u.reply.rstatus  ||
 440             rpc_pkt.u.reply.verifier ||
 441             rpc_pkt.u.reply.astatus  ||
 442             rpc_pkt.u.reply.data[0]) {
 443                 return -1;
 444         }
 445
 446         fs_mounted = 1;
 447         memcpy (dirfh, rpc_pkt.u.reply.data + 1, NFS_FHSIZE);
 448
 449         return 0;
 450 }
 451
 452 static int
 453 nfs_umountall_reply (uchar *pkt, unsigned len)
 454 {
 455         struct rpc_t rpc_pkt;
 456
 457 #ifdef NFS_DEBUG
 458         printf ("%s\n", __FUNCTION__);
 459 #endif
 460
 461         memcpy ((unsigned char *)&rpc_pkt, pkt, len);
 462
 463         if (ntohl(rpc_pkt.u.reply.id) != rpc_id)
 464                 return -1;
 465
 466         if (rpc_pkt.u.reply.rstatus  ||
 467             rpc_pkt.u.reply.verifier ||
 468             rpc_pkt.u.reply.astatus) {
 469                 return -1;
 470         }
 471
 472         fs_mounted = 0;
 473         memset (dirfh, 0, sizeof(dirfh));
 474
 475         return 0;
 476 }
 477
 478 static int
 479 nfs_lookup_reply (uchar *pkt, unsigned len)
 480 {
 481         struct rpc_t rpc_pkt;
 482
 483 #ifdef NFS_DEBUG
 484         printf ("%s\n", __FUNCTION__);
 485 #endif
 486
 487         memcpy ((unsigned char *)&rpc_pkt, pkt, len);
 488
 489         if (ntohl(rpc_pkt.u.reply.id) != rpc_id)
 490                 return -1;
 491
 492         if (rpc_pkt.u.reply.rstatus  ||
 493             rpc_pkt.u.reply.verifier ||
 494             rpc_pkt.u.reply.astatus  ||
 495             rpc_pkt.u.reply.data[0]) {
 496                 return -1;
 497         }
 498
 499         memcpy (filefh, rpc_pkt.u.reply.data + 1, NFS_FHSIZE);
 500
 501         return 0;
 502 }
 503
 504 static int
 505 nfs_readlink_reply (uchar *pkt, unsigned len)
 506 {
 507         struct rpc_t rpc_pkt;
 508         int rlen;
 509
 510 #ifdef NFS_DEBUG
 511         printf ("%s\n", __FUNCTION__);
 512 #endif
 513
 514         memcpy ((unsigned char *)&rpc_pkt, pkt, len);
 515
 516         if (ntohl(rpc_pkt.u.reply.id) != rpc_id)
 517                 return -1;
 518
 519         if (rpc_pkt.u.reply.rstatus  ||
 520             rpc_pkt.u.reply.verifier ||
 521             rpc_pkt.u.reply.astatus  ||
 522             rpc_pkt.u.reply.data[0]) {
 523                 return -1;
 524         }
 525
 526         rlen = ntohl (rpc_pkt.u.reply.data[1]); /* new path length */
 527
 528         if (*((char *)&(rpc_pkt.u.reply.data[2])) != '/') {
 529                 int pathlen;
 530                 strcat (nfs_path, "/");
 531                 pathlen = strlen(nfs_path);
 532                 memcpy (nfs_path+pathlen, (uchar *)&(rpc_pkt.u.reply.data[2]), rlen);
 533                 nfs_path[pathlen+rlen+1] = 0;
 534         } else {
 535                 memcpy (nfs_path, (uchar *)&(rpc_pkt.u.reply.data[2]), rlen);
 536                 nfs_path[rlen] = 0;
 537         }
 538         return 0;
 539 }
 540
 541 static int
 542 nfs_read_reply (uchar *pkt, unsigned len)
 543 {
 544         struct rpc_t rpc_pkt;
 545         int rlen;
 546
 547 #ifdef NFS_DEBUG_nop
 548         printf ("%s\n", __FUNCTION__);
 549 #endif
 550
 551         memcpy ((uchar *)&rpc_pkt, pkt, sizeof(rpc_pkt.u.reply));
 552
 553         if (ntohl(rpc_pkt.u.reply.id) != rpc_id)
 554                 return -1;
 555
 556         if (rpc_pkt.u.reply.rstatus  ||
 557             rpc_pkt.u.reply.verifier ||
 558             rpc_pkt.u.reply.astatus  ||
 559             rpc_pkt.u.reply.data[0]) {
 560                 if (rpc_pkt.u.reply.rstatus) {
 561                         return -9999;
 562                 }
 563                 if (rpc_pkt.u.reply.astatus) {
 564                         return -9999;
 565                 }
 566                 return -ntohl(rpc_pkt.u.reply.data[0]);;
 567         }
 568
 569         if ((nfs_offset!=0) && !((nfs_offset) % (NFS_READ_SIZE/2*10*HASHES_PER_LINE))) {
 570                 puts ("\n\t ");
 571         }
 572         if (!(nfs_offset % ((NFS_READ_SIZE/2)*10))) {
 573                 putc ('#');
 574         }
 575
 576         rlen = ntohl(rpc_pkt.u.reply.data[18]);
 577         if ( store_block ((uchar *)pkt+sizeof(rpc_pkt.u.reply), nfs_offset, rlen) )
 578                 return -9999;
 579
 580         return rlen;
 581 }
 582
 583 /**************************************************************************
 584 Interfaces of U-BOOT
 585 **************************************************************************/
 586
 587 static void
 588 NfsTimeout (void)
 589 {
 590         if ( NfsTimeoutCount++ < NFS_RETRY_COUNT ) {
 591                 NfsSend ();
 592                 return;
 593         }
 594         puts ("Timeout\n");
 595         NetState = NETLOOP_FAIL;
 596         return;
 597 }
 598
 599 static void
 600 NfsHandler (uchar *pkt, unsigned dest, unsigned src, unsigned len)
 601 {
 602         int rlen;
 603
 604 #ifdef NFS_DEBUG
 605         printf ("%s\n", __FUNCTION__);
 606 #endif
 607
 608         if (dest != NfsOurPort) return;
 609
 610         switch (NfsState) {
 611         case STATE_PRCLOOKUP_PROG_MOUNT_REQ:
 612                 rpc_lookup_reply (PROG_MOUNT, pkt, len);
 613                 NfsState = STATE_PRCLOOKUP_PROG_NFS_REQ;
 614                 NfsSend ();
 615                 break;
 616
 617         case STATE_PRCLOOKUP_PROG_NFS_REQ:
 618                 rpc_lookup_reply (PROG_NFS, pkt, len);
 619                 NfsState = STATE_MOUNT_REQ;
 620                 NfsSend ();
 621                 break;
 622
 623         case STATE_MOUNT_REQ:
 624                 if (nfs_mount_reply(pkt, len)) {
 625                         puts ("*** ERROR: Cannot mount\n");
 626                         /* just to be sure... */
 627                         NfsState = STATE_UMOUNT_REQ;
 628                         NfsSend ();
 629                 } else {
 630                         NfsState = STATE_LOOKUP_REQ;
 631                         NfsSend ();
 632                 }
 633                 break;
 634
 635         case STATE_UMOUNT_REQ:
 636                 if (nfs_umountall_reply(pkt, len)) {
 637                         puts ("*** ERROR: Cannot umount\n");
 638                         NetState = NETLOOP_FAIL;
 639                 } else {
 640                         puts ("\ndone\n");
 641                         NetState = NfsDownloadState;
 642                 }
 643                 break;
 644
 645         case STATE_LOOKUP_REQ:
 646                 if (nfs_lookup_reply(pkt, len)) {
 647                         puts ("*** ERROR: File lookup fail\n");
 648                         NfsState = STATE_UMOUNT_REQ;
 649                         NfsSend ();
 650                 } else {
 651                         NfsState = STATE_READ_REQ;
 652                         nfs_offset = 0;
 653                         nfs_len = NFS_READ_SIZE;
 654                         NfsSend ();
 655                 }
 656                 break;
 657
 658         case STATE_READLINK_REQ:
 659                 if (nfs_readlink_reply(pkt, len)) {
 660                         puts ("*** ERROR: Symlink fail\n");
 661                         NfsState = STATE_UMOUNT_REQ;
 662                         NfsSend ();
 663                 } else {
 664 #ifdef NFS_DEBUG
 665                         printf ("Symlink --> %s\n", nfs_path);
 666 #endif
 667                         nfs_filename = basename (nfs_path);
 668                         nfs_path     = dirname (nfs_path);
 669
 670                         NfsState = STATE_MOUNT_REQ;
 671                         NfsSend ();
 672                 }
 673                 break;
 674
 675         case STATE_READ_REQ:
 676                 rlen = nfs_read_reply (pkt, len);
 677                 NetSetTimeout (NFS_TIMEOUT * CFG_HZ, NfsTimeout);
 678                 if (rlen > 0) {
 679                         nfs_offset += rlen;
 680                         NfsSend ();
 681                 }
 682                 else if ((rlen == -NFSERR_ISDIR)||(rlen == -NFSERR_INVAL)) {
 683                         /* symbolic link */
 684                         NfsState = STATE_READLINK_REQ;
 685                         NfsSend ();
 686                 } else {
 687                         if ( ! rlen ) NfsDownloadState = NETLOOP_SUCCESS;
 688                         NfsState = STATE_UMOUNT_REQ;
 689                         NfsSend ();
 690                 }
 691                 break;
 692         }
 693 }
 694
 695
 696 void
 697 NfsStart (void)
 698 {
 699 #ifdef NFS_DEBUG
 700         printf ("%s\n", __FUNCTION__);
 701 #endif
 702         NfsDownloadState = NETLOOP_FAIL;
 703
 704         NfsServerIP = NetServerIP;
 705         nfs_path = (char *)nfs_path_buff;
 706
 707         if (nfs_path == NULL) {
 708                 NetState = NETLOOP_FAIL;
 709                 puts ("*** ERROR: Fail allocate memory\n");
 710                 return;
 711         }
 712
 713         if (BootFile[0] == '\0') {
 714                 sprintf (default_filename, "/nfsroot/%02lX%02lX%02lX%02lX.img",
 715                         NetOurIP & 0xFF,
 716                         (NetOurIP >>  8) & 0xFF,
 717                         (NetOurIP >> 16) & 0xFF,
 718                         (NetOurIP >> 24) & 0xFF );
 719                 strcpy (nfs_path, default_filename);
 720
 721                 printf ("*** Warning: no boot file name; using '%s'\n",
 722                         nfs_path);
 723         } else {
 724                 char *p=BootFile;
 725
 726                 p = strchr (p, ':');
 727
 728                 if (p != NULL) {
 729                         NfsServerIP = string_to_ip (BootFile);
 730                         ++p;
 731                         strcpy (nfs_path, p);
 732                 } else {
 733                         strcpy (nfs_path, BootFile);
 734                 }
 735         }
 736
 737         nfs_filename = basename (nfs_path);
 738         nfs_path     = dirname (nfs_path);
 739
 740 #if defined(CONFIG_NET_MULTI)
 741         printf ("Using %s device\n", eth_get_name());
 742 #endif
 743
 744         puts ("File transfer via NFS from server "); print_IPaddr (NfsServerIP);
 745         puts ("; our IP address is ");              print_IPaddr (NetOurIP);
 746
 747         /* Check if we need to send across this subnet */
 748         if (NetOurGatewayIP && NetOurSubnetMask) {
 749                 IPaddr_t OurNet     = NetOurIP    & NetOurSubnetMask;
 750                 IPaddr_t ServerNet  = NetServerIP & NetOurSubnetMask;
 751
 752                 if (OurNet != ServerNet) {
 753                         puts ("; sending through gateway ");
 754                         print_IPaddr (NetOurGatewayIP) ;
 755                 }
 756         }
 757         printf ("\nFilename '%s/%s'.", nfs_path, nfs_filename);
 758
 759         if (NetBootFileSize) {
 760                 printf (" Size is 0x%x Bytes = ", NetBootFileSize<<9);
 761                 print_size (NetBootFileSize<<9, "");
 762         }
 763         printf ("\nLoad address: 0x%lx\n"
 764                 "Loading: *\b", load_addr);
 765
 766         NetSetTimeout (NFS_TIMEOUT * CFG_HZ, NfsTimeout);
 767         NetSetHandler (NfsHandler);
 768
 769         NfsTimeoutCount = 0;
 770         NfsState = STATE_PRCLOOKUP_PROG_MOUNT_REQ;
 771
 772         /*NfsOurPort = 4096 + (get_ticks() % 3072);*/
 773         /*FIX ME !!!*/
 774         NfsOurPort = 1000;
 775
 776         /* zero out server ether in case the server ip has changed */
 777         memset (NetServerEther, 0, 6);
 778
 779         NfsSend ();
 780 }
 781
 782 #endif